Human GenomeHumans are identified by their 46 chromosomes (23 pairs of homologous chromosomes). We receive 23 chromosomes via the egg cell from our mother and 23 chromosomes via the sperm cell from our father. Sperm and egg cells are haploid, meaning th…

Genetic EngineeringVocabulary: selective breeding, recombinant DNA, artificial selection, inbreeding, hybridization, genetic engineering, restriction enzyme, cloning, genetic mapping, Human Genome ProjectThroughout recorded history, humans have used sel…

BiosphereBiotic vs. AbioticOrganisms with similar needs may compete with one another for resources, including food, space, water, air, and shelter. In any particular environment, the growth and survival of organisms depend on the physical conditions incl…

Frank ICSE Solutions for Class 9 Biology – Health: Causes of Diseases PAGE NO:191 Solution 1. (a) Disease is the stage when body or any part of it shows some disturbance in normal functions. (b) Pathogen refers to any disease causing organism. (c) Infe…

What is Air PressureThe pressure exerted by air is called air pressure. The air in the atmosphere exerts pressure on every object and in all directions (up, down, left, right, etc.). The pressure exerted by the atmosphere depends on many factors. For exa…

Methods Of Sludge DisposalWhat happens to the sludge that is produced after the wastewater passes through the sewage treatment plant? Sludge consists of human faeces and other organic matter. It also has large amounts of water and needs to be thickened s…

Wastewater Treatment PlantA facility that treats wastewater from domestic as well as industrial sources is called a wastewater treatment plant. There are basically three stages involved in treating wastewater: primary, secondary, and tertiary.Primary Tr…

Top 10 Uses Of ForestsForests play a major role in our life. Early humans gathered food and were dependent on forests for all their basic needs such as food, clothing, and shelter. We depend on forests for several or various other things directly or ind…

Different Types Of VitaminsVitamins are needed for the proper functioning of our body. They help in keeping our eyes, bones, teeth, and gums healthy. There are 13 vitamins, each of which has a specific function. Vitamins are of two types: fat-soluble and…

Different Types Of ProteinsProteins are needed by our body for muscle building and repairing worn-out tissues. Our muscles, organs, and even blood are made up of mostly proteins. If we do not eat proteins, our body will not be able to repair damaged cel…